I don't know the Marriott, but stayed at the Hilton Defense (mainly because I found a good deal). It was nice to have direct access to the Metro/RER without need to go outside if it's raining. Also direct access to a big shopping mall. No problem to park in the garage and no need to drive downtown, however quite confusing to find the entrance. The room I had was onto the interior of the mall. No executive lounge if I remember correctly. I would stay there again, as it is very easy to get around Paris with the metro basically in house.